Description of problem:
I was trying to reproduce bug 1036705. I removed all previous disk contents (I think it was LVM on mdraid 10). Then I created a new layout LVM on mdraid 10. I kept only a single / partition and downsized it (from the default size). It crashed on installation start.

anaconda 20.25.11-1 exception report
Traceback (most recent call first):
  File "/usr/lib/python2.7/site-packages/blivet/devicelibs/lvm.py", line 437, in lvactivate
    raise LVMError("lvactivate failed for %s: %s" % (lv_name, msg))
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 2682, in _setup
    lvm.lvactivate(self.vg.name, self._name)
  File "/usr/lib/python2.7/site-packages/blivet/devices.py", line 716, in setup
    self._setup(orig=orig)
  File "/usr/lib/python2.7/site-packages/blivet/deviceaction.py", line 534, in execute
    self.device.setup(orig=True)
  File "/usr/lib/python2.7/site-packages/blivet/devicetree.py", line 234, in processActions
    action.execute()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 308, in doIt
    self.devicetree.processActions()
  File "/usr/lib/python2.7/site-packages/blivet/__init__.py", line 167, in turnOnFilesystems
    storage.doIt()
  File "/usr/lib64/python2.7/site-packages/pyanaconda/install.py", line 142, in doInstall
    turnOnFilesystems(storage, mountOnly=flags.flags.dirInstall)
  File "/usr/lib64/python2.7/threading.py", line 764, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/lib64/python2.7/site-packages/pyanaconda/threads.py", line 192, in run
    threading.Thread.run(self, *args, **kwargs)
LVMError: lvactivate failed for root: running lvm lvchange -a y fedora/root failed


Version-Release number of selected component (if applicable):
anaconda 20.25.11-1 

How reproducible:
unknown